Answer:
42 because 3 tens is 30 and 12 ones is 12. so you do 30 + 12 = 42
1 meter = 1000 mm
so then 5 meters is just 5 * 1000 = 5000 mm.
The discriminant can be determined from the number of roots of the graph.
If Disc> 0, the function has two distinct roots
If Disc = 0, the function has a repeated root
If Disc < 0, the function has no real root.
Since the given graph has no real root, i.e. it does not cross x-axis at any point, so we can say that the discriminant of the given function is negative.
So the answer to this question is option C
-2 = -(x-8)
-2 = -x + 8 ( - * + = - and - * - = + )
-2 - 8 = -x +8 - 8
-2 - 8 = -x
-(2+8) = - x
-10 = -x | * (-1)
x=10
